Lec 8 - Mirror, Adhesion, Class III RBC Flashcards
mirror should be positioned so not to contact the blank
handpiece
mirror should be positioned to avoid blank from the high speed handpiece
water spray
blank vision is preferred
direct
blank vision is used when using direct vision would result in improper operator positioning
indirect
proper position of mirror should be where we can see this as the center of focus
seeing bur contacting tooth
mirror position is constantly blank to see all surfaces of the preparation
changed
mirror should be positioned blank the wall being prepared
opposite
before using indirect vision, always use direct vision before the procedure to make sure blank is right
angle of the handpiece
other sensory feedback that can be used to monitor handpiece and bur
proprioceptive, tactile
mirror should be as blank as possible from handpiece
far
another uses of intraoral mirror
reflect light, retract cheek, retract tongue
result of interactions of a layer of intermediate material with two surfaces producing two adhesive interfaces
adhesive joint
intermediate material is aka
adhesive
two surfaces being stuck together
adherend
the guy who talked about selective demineralization of enamel
buonocore
the guy who developed the first bis gma resin
bowen
enamel is blank percent mineral, blank percent organic, blank percent water
95, 4, 1
enamel is formed by prisms of blank crystals
hydroxyapatite
dentin is blank percent inorganic, blank percent organic, blank percent water
70, 20, 10
dentin is a blank wet, and tubular structure
permeable
dentin is more mineralized type of dentin
peritubular
dentin rich in collagen fibers and is ideal for hybridization
intertubular
adhesion to tooth structure is primarily blank
micromechanical
current adhesive systems provide bonding to blank and blank substrates
hydrophilic, hydrophobic
current classification of dental adhesive systems
clinical application steps (1,2,3), or underlying adhesive strategy (etch and rinse, self etch)
this cleans and prepares surface and removes smear layer
etch (acid)
this infiltrates exposed collagen network and displaces moisture and links to hydrophobic adhesive
primer
this provides links to resin composite
adhesive
the only bonding material that forms a chemical bond
glass ionomer
optibond is a blank system
etch and rinse system
smear is the blank layer
mineralized
regardless of the method used, the enamel and dentin must be blank in order to achieve adhesion to the restorative resin
etching
ideal acid to etch enamel
phosphoric
phosphoric acid takes this long to etch
15-20 secs
phosphoric acid is a blank acid
inorganic
these can all have effects of acid etch
type of acid, etch time, acid conc, pH, form of etchant, rinse time
predictable bond strength of enamel etching
20 MPa
dentin should never be etched for longer than blank or it can be detrimental
15 secs
etched enamel has a blank appearance but dentin doesnt
chalky
deep dentin has more blank dentin so has blank bond strengths compared to superficial
peritubular (large tubules)
these are only needed in dentin because it is more hydrophilic
primers
primers are adhesion promoters that increase surface tension of the blank
collagen
adhesives are very blank so no moisture contamination
hydrophobic
adhesive like bis gma are more blank and blank viscous
hydrophobic, more
wet bonding means that blank is required
removal of smear layer
layer composed of resin, collagen fibrils, and partially demineralized dentin
hybrid layer
steps for dentin restoration
etch, primer, adhesive, resin composite
class 3 caries
smooth surface of proximal surfaces of anterior teeth beginning just gingival to contact
